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#include "MantidKernel/CPUTimer.h"
#include <sstream>
#include <iomanip>
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namespace Mantid {
namespace Kernel {
//----------------------------------------------------------------------------------------------
/** Constructor
*/
CPUTimer::CPUTimer() {
// Record the starting time
reset();
}
//----------------------------------------------------------------------------------------------
/** Destructor
*/
CPUTimer::~CPUTimer() {}
/// Explicitly reset the timer.
void CPUTimer::reset() {
#ifdef _WIN32
#else /* linux & mac */
m_start = clock();
#endif
m_wallClockTime.reset();
}
/** Calculate the elapsed CPU time, reseting the timer if specified
*
* @param doReset :: true to reset the timer
* @return time in CPU seconds
*/
float CPUTimer::elapsedCPU(bool doReset) {
float retval = 0;
#ifdef _WIN32
UNUSED_ARG(doReset);
#else /* linux & mac */
clock_t end = clock();
retval = ((float)(end - m_start)) / CLOCKS_PER_SEC;
if (doReset)
this->reset();
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#endif
return retval;
}
/** Calculate the elapsed wall-clock time, reseting the timer if specified
*
* @param doReset :: true to reset the timer
* @return wall-clock time, in seconds
*/
float CPUTimer::elapsedWallClock(bool doReset) {
float retVal = m_wallClockTime.elapsed(false);
if (doReset)
this->reset();
return retVal;
}
/** Return the fraction of the CPU used (CPUTime/wall-clock time).
* This can be > 1 on multi-CPU systems.
*
* @param doReset :: true to reset both timers
* @return
*/
float CPUTimer::CPUfraction(bool doReset) {
// Get the wall-clock time without resetting.
double wallTime = m_wallClockTime.elapsed(false);
double cpuTime = elapsedCPU(false);
if (doReset)
this->reset();
return static_cast<float>((cpuTime / wallTime));
}
/// Convert the elapsed time (without reseting) to a string.
std::string CPUTimer::str() {
std::stringstream buffer;
buffer << std::fixed << std::setw(7) << std::setprecision(4)
<< m_wallClockTime.elapsed_no_reset() << " s, CPU "
<< std::setprecision(2) << this->CPUfraction(false);
this->reset();
return buffer.str();
}
/// Convenience function to provide for easier debug printing.
std::ostream &operator<<(std::ostream &out, CPUTimer &obj) {
out << obj.str();
return out;
}
} // namespace Mantid
} // namespace Kernel